<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>公众号关注：前端Hardy</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background: #e8e8e8;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
        }

        .loader {
            scale: 3;
            height: 50px;
            width: 40px;
        }

        .box {
            position: relative;
            opacity: 0;
            left: 10px;
        }

        .side-left {
            position: absolute;
            background-color: #286cb5;
            width: 19px;
            height: 5px;
            transform: skew(0deg, -25deg);
            top: 14px;
            left: 10px;
        }

        .side-right {
            position: absolute;
            background-color: #2f85e0;
            width: 19px;
            height: 5px;
            transform: skew(0deg, 25deg);
            top: 14px;
            left: -9px;
        }

        .side-top {
            position: absolute;
            background-color: #5fa8f5;
            width: 20px;
            height: 20px;
            rotate: 45deg;
            transform: skew(-20deg, -20deg);
        }

        .box-1 {
            animation: from-left 4s infinite;
        }

        .box-2 {
            animation: from-right 4s infinite;
            animation-delay: 1s;
        }

        .box-3 {
            animation: from-left 4s infinite;
            animation-delay: 2s;
        }

        .box-4 {
            animation: from-right 4s infinite;
            animation-delay: 3s;
        }

        @keyframes from-left {
            0% {
                z-index: 20;
                opacity: 0;
                translate: -20px -6px;
            }

            20% {
                z-index: 10;
                opacity: 1;
                translate: 0px0px;
            }

            40% {
                z-index: 9;
                translate: 0px4px;
            }

            60% {
                z-index: 8;
                translate: 0px8px;
            }

            80% {
                z-index: 7;
                opacity: 1;
                translate: 0px12px;
            }

            100% {
                z-index: 5;
                translate: 0px30px;
                opacity: 0;
            }
        }

        @keyframes from-right {
            0% {
                z-index: 20;
                opacity: 0;
                translate: 20px -6px;
            }

            20% {
                z-index: 10;
                opacity: 1;
                translate: 0px0px;
            }

            40% {
                z-index: 9;
                translate: 0px4px;
            }

            60% {
                z-index: 8;
                translate: 0px8px;
            }

            80% {
                z-index: 7;
                opacity: 1;
                translate: 0px12px;
            }

            100% {
                z-index: 5;
                translate: 0px30px;
                opacity: 0;
            }
        }
    </style>
</head>

<body>
    <div class="loader">
        <div class="box box-1">
            <div class="side-left"></div>
            <div class="side-right"></div>
            <div class="side-top"></div>
        </div>
        <div class="box box-2">
            <div class="side-left"></div>
            <div class="side-right"></div>
            <div class="side-top"></div>
        </div>
        <div class="box box-3">
            <div class="side-left"></div>
            <div class="side-right"></div>
            <div class="side-top"></div>
        </div>
        <div class="box box-4">
            <div class="side-left"></div>
            <div class="side-right"></div>
            <div class="side-top"></div>
        </div>
    </div>
</body>

</html>